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Tiger,
Because you are known to go above & beyond when it comes
to trying to protect the citizenry, ...I STRONGLY recommend that
you obtain \ create a very large identification tag, ...to include
language sufficient enough to clearly identify the valve, its
purpose, and the date of your identification........Include other
information relevant to any safety concerns that you have.
The information that you place on the Identification Tag should
be in English & Spanish, and printed, not hand-written......I also
STRONGLY recommend that you laminate both sides of the Tag
once you have formatted it with the information, then attach the
Tag to the valve with sheathed wire, or some other means that
has long term durability features........Zip Ties tend to deteriorate
more quickly than sheathed electrical conductors.
I did not find a Code Section "requirement" in the California
Plumbing Code, however, as a reference in the `15 IFGC, see
Section 409.3.3 - Identification of Shut-Off Valves: "Each
house line shut-off valve shall be plainly marked with an identification
tag attached by the installer so that the piping systems supplied
by such valves are readily identified".
FWIW, ...it is O.K. to go above and beyond again, to [ attempt to ]
protect the current & future occupants of the structure.
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